[td-225] fix error for super table subqueries.

src/client/src/tscServer.c

@@ -219,7 +219,7 @@ void tscProcessMsgFromServer(SRpcMsg *rpcMsg, SRpcIpSet *pIpSet) {
   STscObj *pObj = pSql->pTscObj;
   // tscTrace("%p msg:%s is received from server", pSql, taosMsg[rpcMsg->msgType]);
 
-  if (pObj->signature != pObj) {
+  if (pObj->signature != pObj || pSql->freed == 1) {
     tscTrace("%p sql is already released or DB connection is closed, freed:%d pObj:%p signature:%p", pSql, pSql->freed,
              pObj, pObj->signature);
     tscFreeSqlObj(pSql);

src/client/src/tscSql.c

@@ -522,7 +522,14 @@ void taos_free_result(TAOS_RES *res) {
     // in case of sync model query, waits for response and then goes on
     if (pSql->fp == waitForQueryRsp || pSql->fp == waitForRetrieveRsp) {
       sem_wait(&pSql->rspSem);
+
+      tscFreeSqlObj(pSql);
+      tscTrace("%p sqlObj is freed by app", pSql);
+    } else {
+      tscTrace("%p sqlObj will be freed while rsp received", pSql);
     }
+
+    return;
   }
 
   tscFreeSqlObj(pSql);

src/vnode/src/vnodeRead.c

@@ -90,7 +90,7 @@ static int32_t vnodeProcessQueryMsg(SVnodeObj *pVnode, SReadMsg *pReadMsg) {
     assert(pReadMsg->rpcMsg.contLen > 0 && killQueryMsg->free == 1);
 
     qKillQuery((qinfo_t) killQueryMsg->qhandle);
-    return TSDB_CODE_SUCCESS;
+    return TSDB_CODE_TSC_QUERY_CANCELLED; // todo error
   }
 
   int32_t code = TSDB_CODE_SUCCESS;